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Add sm4_MODE_encrypt_blocks

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This commit is contained in:
Zhi Guan
2024-04-29 22:35:25 +08:00
parent 33c546f48a
commit 5cf6f2609e
10 changed files with 618 additions and 121 deletions
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83
src/sm4.c
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@@ -180,3 +180,86 @@ void sm4_encrypt_blocks(const SM4_KEY *key, const uint8_t *in, size_t nblocks, u
out += 16;
}
}
void sm4_cbc_encrypt_blocks(const SM4_KEY *key, const uint8_t iv[16],
const uint8_t *in, size_t nblocks, uint8_t *out)
{
while (nblocks--) {
size_t i;
for (i = 0; i < 16; i++) {
out[i] = in[i] ^ iv[i];
}
sm4_encrypt(key, out, out);
iv = out;
in += 16;
out += 16;
}
}
void sm4_cbc_decrypt_blocks(const SM4_KEY *key, const uint8_t iv[16],
const uint8_t *in, size_t nblocks, uint8_t *out)
{
while (nblocks--) {
size_t i;
sm4_encrypt(key, in, out);
for (i = 0; i < 16; i++) {
out[i] ^= iv[i];
}
iv = in;
in += 16;
out += 16;
}
}
static void ctr_incr(uint8_t a[16]) {
int i;
for (i = 15; i >= 0; i--) {
a[i]++;
if (a[i]) break;
}
}
void sm4_ctr_encrypt(const SM4_KEY *key, uint8_t ctr[16], const uint8_t *in, size_t inlen, uint8_t *out)
{
uint8_t block[16];
size_t len, i;
while (inlen) {
len = inlen < 16 ? inlen : 16;
sm4_encrypt(key, ctr, block);
for (i = 0; i < len; i++) {
out[i] = in[i] ^ block[i];
}
ctr_incr(ctr);
in += len;
out += len;
inlen -= len;
}
}
// inc32() in nist-sp800-38d
static void ctr32_incr(uint8_t a[16]) {
int i;
for (i = 15; i >= 12; i--) {
a[i]++;
if (a[i]) break;
}
}
void sm4_ctr32_encrypt(const SM4_KEY *key, uint8_t ctr[16], const uint8_t *in, size_t inlen, uint8_t *out)
{
uint8_t block[16];
size_t len, i;
while (inlen) {
len = inlen < 16 ? inlen : 16;
sm4_encrypt(key, ctr, block);
for (i = 0; i < len; i++) {
out[i] = in[i] ^ block[i];
}
ctr32_incr(ctr);
in += len;
out += len;
inlen -= len;
}
}